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Tunable hollow laser based on electro-optical crystal axicon

An electro-optic crystal and laser technology, which is applied in the field of lasers, can solve the problems that affect the application of hollow lasers, the wavelength of hollow lasers cannot be precisely tuned, and the activation medium cannot form hollow gains.

Pending Publication Date: 2022-04-12
YUNNAN UNIV
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Problems solved by technology

However, in the current technology, the pump beam cannot be focused into a hollow focal ring, so the active medium cannot form a hollow gain
In addition, the wavelength of the hollow-core laser cannot be precisely tuned, which seriously affects the application of the hollow-core laser.

Method used

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  • Tunable hollow laser based on electro-optical crystal axicon
  • Tunable hollow laser based on electro-optical crystal axicon
  • Tunable hollow laser based on electro-optical crystal axicon

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specific Embodiment

[0046] Specifically, the following unit devices can be used to realize the tunable hollow-core laser based on the electro-optic crystal axicon: fiber-coupled semiconductor laser array 1 adopts a fiber-coupled semiconductor laser array with an output wavelength of 976nm, the fiber core diameter is 400μm, and the numerical aperture is 0.22; the focal length of the plano-convex lens 2 200mm, the light-transmitting surface is coated with a 976nm anti-reflection coating; the beam expander axicon 3 is made of K9 glass, its cone angle ω=120°, and the light-transmitting surface is coated with a 976nm anti-reflection coating; the focal length of the first convex lens 4 is 500mm, through The smooth surface is coated with 976nm anti-reflection coating; the pump beam is collimated by the plano-convex lens 2, and the beam passes through the beam expander axicon 3 to form two beams with a beam expansion angle of 30°; the axicon gain medium 5 is made of Yb:GdCOB crystal , whose emission spect...

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Abstract

The invention discloses a tunable hollow laser based on an electro-optical crystal axicon, which comprises an optical fiber coupling semiconductor laser array, the hollow coupling optical system, the axicon gain medium, the second convex lens, the positive electrode, the positive electro-optical crystal axicon, the negative electro-optical crystal axicon and the negative electrode are sequentially arranged on an output light path of the optical fiber coupling semiconductor laser array; the positive generatrix plane of the axicon gain medium and the generatrix plane of the positive electro-optical crystal axicon form a resonant cavity of the annular operation hollow laser, the axicon gain medium is an input mirror of the resonant cavity, and the positive electro-optical crystal axicon is an output mirror of the resonant cavity; the optical path of the laser passing through the positive electric optical axis cone is adjusted by adjusting the voltage at the two ends of the positive electrode and the negative electrode, so that the transmittance of the laser wavelength is changed, and the laser wavelength is precisely tuned.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a tunable hollow laser based on an electro-optic crystal axicon. Background technique [0002] People have used different methods, such as geometric optics, optical holography, and computational holography, to develop non-Gaussian beams with various light intensity distributions, such as anti-Gaussian beams, Airy beams, and Bessel beams. The field is also expanding. A typical hollow beam is a hollow beam, and the polarization state of the hollow beam is usually uniform polarization, such as linear polarization, circular polarization or elliptical polarization. However, non-uniformly polarized beams have important applications in many fields, for example, under the same conditions for laser cutting, non-uniformly polarized light has higher energy absorption efficiency than uniformly polarized laser, which can increase the processing efficiency by 2-4 times . The typical method o...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/094
Inventor 吕彦飞魏飞飞夏菁刘会龙贾梦涵杜振华张倩
Owner YUNNAN UNIV
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